The archive does not have to be extracted to the filesystem root
(/).
This pack relies either on the "user namespace" feature of the Linux kernel or
on PRoot to setup a virtual root
folder for Nyxt in the root of the extracted archive.

If Nyxt does not work for you at this point, you might have to enable
user namespaces. Try to run the following in a shell:

sudo sysctl -w kernel.unprivileged_userns_clone=1

If the previous command did not work

You might have to issue the following instead:

sudo sh -c 'echo 0 > /proc/sys/kernel/userns_restrict'

or, depending on your kernel compilation options:

sudo sh -c 'echo 1 > /proc/sys/kernel/unprivileged_userns_clone'

If none of the above works, your kernel might not support user
namespaces. You might have to compile a custom kernel to enable this
feature, but at this point it's probably easier to
install Guix and run